SourceFileLoader.load_module() is mixing content of previosly loaded files

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-06-16.06:44:26.616>
labels = ['3.9']
title = 'SourceFileLoader.load_module() is mixing content of previosly loaded files'
updated_at = <Date 2021-06-16.06:44:26.616>
user = 'https://github.com/blackandred'

bugs.python.org fields:

activity = <Date 2021-06-16.06:44:26.616>
actor = 'blackandred'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2021-06-16.06:44:26.616>
creator = 'blackandred'
dependencies = []
files = []
hgrepos = ['406']
issue_num = 44432
keywords = []
message_count = 1.0
messages = ['395908']
nosy_count = 1.0
nosy_names = ['blackandred']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue44432'
versions = ['Python 3.9']